What is Nutrition in Plants Types and Photosynthesis Process
Plants are like all other living things. They also need food for their growth and development. For the survival of the plants, they also require 16 essential elements. Some of these elements are Carbon, Hydrogen, and Oxygen, which are derived from the atmosphere and soil water.
There are also thirteen essential elements, such as nitrogen, phosphorus, calcium, potassium, magnesium, iron, sulfur, manganese, zinc, copper, boron, molybdenum, and chlorine. These elements are provided either from soil minerals and soil organic matter or by organic or inorganic fertilizers.
To utilize these nutrients efficiently, plants also require light, heat, and water. These factors must be adequately supplied. In crop production, some of these factors play important roles such as cultural practices and control of diseases and getting rid of insects.
Modes of Nutrition
We can define nutrition as it is the procedure of gaining food and applying it to grow, repair any damaged body part, and stay healthy. Some processes are involved in the nutrition of plants as they produce their food by taking raw materials from their surroundings, such as minerals, carbon dioxide, water, and sunlight.
The Two Modes of Nutrition are:
Autotrophic – Plants are called the primary producer as they exhibit autotrophic nutrition. Also, plants synthesize their food by using light, carbon dioxide, and water.
Heterotrophic – Under this category, animals and human beings are included as they depend on plants for their food.
(Image to be added soon)
Plant Nutrients
For plant nutrition, some major sources are there. A plant converts the atmospheric CO2 into simple sugar by using the energy of the sun. Carbon dioxide (CO2) enters through the stomata. Oxygen (O2) is also a product of photosynthesis. It is an atmospheric component that also moves through the stomata.
In plants, oxygen is used in cellular respiration to release energy from the chemical bonds in the sugar to support growth and maintenance in the plant. The only reason is that CO2 and light energy are not sufficient for the synthesis of all the molecules a plant needs.
(Image to be added soon)
It is also proven that plants require many inorganic nutrients. We call these elements macronutrients. These organic nutrients are required for the plants in relatively large amounts. Other micronutrients are also required in trace amounts.
Scientists have collected around nine macronutrients, such as Carbon, Hydrogen, and Oxygen, the three elements found in all organic compounds as well as nitrogen.
Soil
Soil composition plays an important role in a plant’s growth. We can define the soil as it is the highly weathered outer layer of the earth’s crust.
Soil is made of a mixture of ingredients, which may include sand, rocks of various sizes, clay, silt, hummus, and various other forms of mineral and organic matter. Also, some pore spaces are there containing water, and air occurs between the particles.
Nitrogen Nutrient Functions
Nitrogen is an important nutrient for plants. It is biologically combined with C, H, O, and S to create amino acids, which are the building blocks of proteins.
Plants are using the amino acids to form protoplasm, the site for cell division, and thus for plant growth and development.
Nitrogen is desired for all the enzymatic reactions in a plant as all the plants’ enzymes are made of proteins.
N is necessary for photosynthesis as it plays a major part in the chlorophyll molecule.
To form several vitamins in plants during photosynthesis, N is the necessary component for them.
Nitrogen helps the plant to improve the quality and quantity of dry matter. They are available in leafy vegetables and protein in grain crops.
Phosphorus Nutrient Functions
P plays a major role in photosynthesis and respiration. It also helps in energy storage and transfers them as ADP, ATP (adenosine di-phosphate and biphosphate), DPN, and TPN (di - phosphotyrosine and tri - phosphotyrosine nucleotide).
RNA and DNA structures are the major components of genetic information. P helps the plants to carry the genes.
P is found in seeds with the highest concentration in a mature plant. A huge amount of P is required in young cells, such as shoots and root tips as in here, the metabolism is high, and cell division is rapid.
Phosphorus takes part in root development, flower initiation, and seed and fruit development.
Phosphorus helps to reduce disease probability among some plants. It has been found to improve the quality of certain crops.
Do You Know?
We have found some awesome facts about plants. A plant is unique and has an optimum nutrient range as well as a minimum required level. When the plants reach a minimum level, then they start to show nutrient deficiency symptoms.
Too much consumption of nutrients can also cause poor growth because of toxicity. That is why the appropriate amount of application and placement of the nutrients is vital.
Autotrophic Nutrition in Plants
Photosynthesis is a mechanism that allows plants to manufacture their nourishment.
Photosynthesis takes place in the chloroplast.
The majority of food production takes place in leaves. The root absorbs water and nutrients from the soil and transports them to the leaves through vessels. Stomata, which are microscopic holes on leaves bordered by guard cells, allow carbon dioxide to access the leaves.
Chlorophyll is a green pigment found in leaves that aids in the collection of energy from the sun for the leaves to prepare their meal. Photosynthesis is the process of food creation that occurs in the presence of sunshine. As a result, all living species rely on the sun as their principal source of energy.
In the presence of sunshine, water and carbon dioxide are utilised to build carbohydrates and oxygen during photosynthesis. All living things get their sustenance via photosynthesis.
Essential Nutrients for Plants
Plants require particular elements or compounds known as plant vital nutrients to grow, develop, and produce at their optimum.
A plant lacking an important nutrient will not be able to complete its life cycle—the seed will not germinate; the plant will not be able to form adequate roots, stalks, leaves, or flowers; and it will not be able to generate seeds to make new plants. Frequently, the plant will perish.
Too much of a nutrient, on the other hand, can damage or even kill plants. Too much nitrogen, for example, might lead a plant to produce more leaves but less or no fruit. If the leaves are exposed to too much manganese, they will turn yellow and finally die. Furthermore, too much boron can kill a plant.
Conditions Required for Photosynthesis:
Sunlight
Water
Carbon dioxide is a greenhouse gas
Chlorophyll
Photosynthesis is Broken Down into Several Steps:
The process of absorbing energy from the sun.
Light energy is converted into chemical energy.
Water is broken down into oxygen and hydrogen through hydrolysis.
Chemical energy is used to convert carbon dioxide to glucose.
Plants with Heterotrophic Nutrition
Some plants lack chlorophyll and rely on other plants for nourishment, which is known as the heterotrophic mode of feeding. Heterotrophic nutrition in plants is what these types of nutrition are termed, and parasites are what they are named.
Heterotrophic Plants
Different varieties of heterotrophic plants are listed below, which are mostly categorised depending on their style of nutrition:
Parasitic
Insectivorous
Saprophytic
Symbiotic
Parasitic Nutrition
Some heterotrophic plants rely on the sustenance of other plants and animals. Parasitic plants are those that feed on other plants. The parasite, on the other hand, does not help the host.
Example - Cuscuta, Cassytha, etc.
Conclusion
For the survival of plants, they also require 16 essential elements. Scientists have Derived Two Modes of Nutrition; Autotrophic and Heterotrophic. Plants synthesize their food by using minerals, carbon dioxide, water, and sunlight. These factors must be adequately supplied for growth and development.
FAQs on Nutrition in Plants and Modes of Nourishment
1. What is nutrition in plants?
Nutrition in plants is the process by which plants obtain and utilize nutrients to produce energy and support growth. In most green plants, this occurs through autotrophic nutrition, where they prepare their own food using photosynthesis.
- Plants absorb water and minerals from the soil through roots.
- They take in carbon dioxide from the air through stomata.
- Using sunlight and chlorophyll, they synthesize glucose.
2. What are the different modes of nutrition in plants?
Plants show different modes of nutrition, mainly classified as autotrophic and heterotrophic nutrition. While most plants are autotrophic, some depend partly or fully on other organisms.
- Autotrophic nutrition – Plants make their own food by photosynthesis (e.g., sunflower).
- Parasitic nutrition – Obtain nutrients from a host plant (e.g., Cuscuta).
- Saprophytic nutrition – Feed on dead and decaying matter (e.g., Monotropa).
- Insectivorous nutrition – Trap and digest insects for nutrients (e.g., Venus flytrap).
3. How does photosynthesis occur in plants?
Photosynthesis in plants occurs in the chloroplasts, where light energy is converted into chemical energy in the form of glucose. It involves two main stages:
- Light reaction – Takes place in the thylakoid membranes and produces ATP and NADPH using sunlight.
- Dark reaction (Calvin cycle) – Occurs in the stroma and uses ATP and NADPH to fix carbon dioxide into glucose.
4. What are macronutrients and micronutrients in plant nutrition?
Macronutrients and micronutrients are essential mineral elements required by plants in large and small quantities, respectively. Both are vital for proper plant growth and metabolism.
- Macronutrients – Needed in large amounts (e.g., Nitrogen, Phosphorus, Potassium, Calcium, Magnesium).
- Micronutrients – Needed in trace amounts (e.g., Iron, Zinc, Copper, Manganese).
5. Why is nitrogen important in plant nutrition?
Nitrogen is important in plant nutrition because it is a key component of proteins, nucleic acids, and chlorophyll. Plants absorb nitrogen mainly in the form of nitrates or ammonium ions from the soil.
- Essential for leaf growth and green coloration.
- Required for enzyme and DNA synthesis.
- Deficiency causes yellowing of leaves (chlorosis).
6. What is mineral nutrition in plants?
Mineral nutrition in plants refers to the absorption and utilization of inorganic mineral elements from the soil. These minerals are absorbed by root hairs and transported through the xylem.
- Minerals are required for enzyme activation.
- They help in chlorophyll formation and energy transfer.
- They support structural and metabolic functions.
7. How do plants absorb water and minerals from the soil?
Plants absorb water and minerals from the soil mainly through root hairs by osmosis and active transport. The absorbed substances move upward through vascular tissues.
- Osmosis – Water enters root cells from higher to lower water potential.
- Active transport – Minerals are absorbed against concentration gradient using energy.
- Transport occurs via the xylem to stems and leaves.
8. What is the difference between autotrophic and heterotrophic nutrition in plants?
The main difference between autotrophic and heterotrophic nutrition is that autotrophic plants make their own food, while heterotrophic plants depend on other organisms. This distinction is based on how food is obtained.
- Autotrophic nutrition – Uses sunlight, carbon dioxide, and water to produce glucose (e.g., green plants).
- Heterotrophic nutrition – Obtains ready-made food from other organisms (e.g., parasitic plants like Cuscuta).
9. What are insectivorous plants and why do they trap insects?
Insectivorous plants are green plants that trap and digest insects to obtain additional nutrients, especially nitrogen. They perform photosynthesis but grow in nitrogen-deficient soils.
- Examples include Venus flytrap, Pitcher plant, and Sundew.
- They have modified leaves to trap insects.
- Digestive enzymes break down the insect body.
10. What happens if plants lack essential nutrients?
If plants lack essential nutrients, they show deficiency symptoms that affect growth, development, and productivity. Each nutrient deficiency has characteristic signs.
- Nitrogen deficiency – Yellowing of older leaves.
- Iron deficiency – Interveinal chlorosis in young leaves.
- Phosphorus deficiency – Poor root and flower development.
